If you are looking for an alternative to monetize your site or app with advertising, PropellerAds is a great choice! Their network offers very nice push-up ads for mobile solutions and they have a broad publisher base to match your content!
Some of the key features they promote for the network are:
1. Payouts 200% higher than anywhere else due to detailed optimization of each site individually and selecting the best performing campaigns.2. Quick and in-time payouts by any payment method convenient to you.3. 100% monetization of your inventory at all ad formats at maximum CPM rates. Try it now to increase profit from your site.
We are using them as well on some free apps and are very happy with the payout and quality of the advertising. A good solid alternative!